//
//===----------------------------------------------------------------------===//
-#ifndef LLVM_MDNODE_H
-#define LLVM_MDNODE_H
+#ifndef LLVM_METADATA_H
+#define LLVM_METADATA_H
-#include "llvm/User.h"
-#include "llvm/Type.h"
-#include "llvm/OperandTraits.h"
+#include "llvm/Value.h"
#include "llvm/ADT/FoldingSet.h"
-#include "llvm/ADT/SmallVector.h"
-#include "llvm/ADT/SmallPtrSet.h"
-#include "llvm/ADT/DenseMap.h"
-#include "llvm/ADT/StringMap.h"
#include "llvm/ADT/ilist_node.h"
-#include "llvm/Support/ErrorHandling.h"
-#include "llvm/Support/ValueHandle.h"
namespace llvm {
class Constant;
class Instruction;
class LLVMContext;
-
-//===----------------------------------------------------------------------===//
-// MetadataBase - A base class for MDNode, MDString and NamedMDNode.
-class MetadataBase : public User {
-private:
- /// ReservedSpace - The number of operands actually allocated. NumOperands is
- /// the number actually in use.
- unsigned ReservedSpace;
-
-protected:
- MetadataBase(const Type *Ty, unsigned scid)
- : User(Ty, scid, NULL, 0), ReservedSpace(0) {}
-
- void resizeOperands(unsigned NumOps);
-public:
- /// isNullValue - Return true if this is the value that would be returned by
- /// getNullValue. This always returns false because getNullValue will never
- /// produce metadata.
- virtual bool isNullValue() const {
- return false;
- }
-
- /// Methods for support type inquiry through isa, cast, and dyn_cast:
- static inline bool classof(const MetadataBase *) { return true; }
- static bool classof(const Value *V) {
- return V->getValueID() == MDStringVal || V->getValueID() == MDNodeVal
- || V->getValueID() == NamedMDNodeVal;
- }
-};
-
+class Module;
+template <typename T> class SmallVectorImpl;
+template<typename ValueSubClass, typename ItemParentClass>
+ class SymbolTableListTraits;
+
+
//===----------------------------------------------------------------------===//
/// MDString - a single uniqued string.
/// These are used to efficiently contain a byte sequence for metadata.
/// MDString is always unnamd.
-class MDString : public MetadataBase {
+class MDString : public Value {
MDString(const MDString &); // DO NOT IMPLEMENT
- void *operator new(size_t, unsigned); // DO NOT IMPLEMENT
- unsigned getNumOperands(); // DO NOT IMPLEMENT
StringRef Str;
protected:
- explicit MDString(LLVMContext &C, const char *begin, unsigned l)
- : MetadataBase(Type::getMetadataTy(C), Value::MDStringVal), Str(begin, l) {}
+ explicit MDString(LLVMContext &C, StringRef S);
public:
- // Do not allocate any space for operands.
- void *operator new(size_t s) {
- return User::operator new(s, 0);
- }
- static MDString *get(LLVMContext &Context, const StringRef &Str);
+ static MDString *get(LLVMContext &Context, StringRef Str);
+ static MDString *get(LLVMContext &Context, const char *Str);
StringRef getString() const { return Str; }
- unsigned length() const { return Str.size(); }
+ unsigned getLength() const { return (unsigned)Str.size(); }
+ typedef StringRef::iterator iterator;
+
/// begin() - Pointer to the first byte of the string.
///
- const char *begin() const { return Str.begin(); }
+ iterator begin() const { return Str.begin(); }
/// end() - Pointer to one byte past the end of the string.
///
- const char *end() const { return Str.end(); }
+ iterator end() const { return Str.end(); }
/// Methods for support type inquiry through isa, cast, and dyn_cast:
static inline bool classof(const MDString *) { return true; }
}
};
+
+class MDNodeOperand;
+
//===----------------------------------------------------------------------===//
/// MDNode - a tuple of other values.
-/// These contain a list of the values that represent the metadata.
-/// MDNode is always unnamed.
-class MDNode : public MetadataBase, public FoldingSetNode {
+class MDNode : public Value, public FoldingSetNode {
MDNode(const MDNode &); // DO NOT IMPLEMENT
- void *operator new(size_t, unsigned); // DO NOT IMPLEMENT
- // getNumOperands - Make this only available for private uses.
- unsigned getNumOperands() { return User::getNumOperands(); }
-
- friend class ElementVH;
- // Use CallbackVH to hold MDNOde elements.
- struct ElementVH : public CallbackVH {
- MDNode *Parent;
- ElementVH(Value *V, MDNode *P) : CallbackVH(V), Parent(P) {}
- ~ElementVH() {}
-
- virtual void deleted() {
- Parent->replaceElement(this->operator Value*(), 0);
- }
+ void operator=(const MDNode &); // DO NOT IMPLEMENT
+ friend class MDNodeOperand;
+ friend class LLVMContextImpl;
- virtual void allUsesReplacedWith(Value *NV) {
- Parent->replaceElement(this->operator Value*(), NV);
- }
+ /// NumOperands - This many 'MDNodeOperand' items are co-allocated onto the
+ /// end of this MDNode.
+ unsigned NumOperands;
+
+ // Subclass data enums.
+ enum {
+ /// FunctionLocalBit - This bit is set if this MDNode is function local.
+ /// This is true when it (potentially transitively) contains a reference to
+ /// something in a function, like an argument, basicblock, or instruction.
+ FunctionLocalBit = 1 << 0,
+
+ /// NotUniquedBit - This is set on MDNodes that are not uniqued because they
+ /// have a null perand.
+ NotUniquedBit = 1 << 1,
+
+ /// DestroyFlag - This bit is set by destroy() so the destructor can assert
+ /// that the node isn't being destroyed with a plain 'delete'.
+ DestroyFlag = 1 << 2
};
- // Replace each instance of F from the element list of this node with T.
- void replaceElement(Value *F, Value *T);
-
- SmallVector<ElementVH, 4> Node;
+
+ // FunctionLocal enums.
+ enum FunctionLocalness {
+ FL_Unknown = -1,
+ FL_No = 0,
+ FL_Yes = 1
+ };
+
+ /// replaceOperand - Replace each instance of F from the operand list of this
+ /// node with T.
+ void replaceOperand(MDNodeOperand *Op, Value *NewVal);
+ ~MDNode();
protected:
- explicit MDNode(LLVMContext &C, Value*const* Vals, unsigned NumVals);
+ explicit MDNode(LLVMContext &C, Value *const *Vals, unsigned NumVals,
+ bool isFunctionLocal);
+
+ static MDNode *getMDNode(LLVMContext &C, Value *const *Vals, unsigned NumVals,
+ FunctionLocalness FL, bool Insert = true);
public:
- // Do not allocate any space for operands.
- void *operator new(size_t s) {
- return User::operator new(s, 0);
- }
// Constructors and destructors.
- static MDNode *get(LLVMContext &Context,
- Value* const* Vals, unsigned NumVals);
-
- /// dropAllReferences - Remove all uses and clear node vector.
- void dropAllReferences();
-
- /// ~MDNode - Destroy MDNode.
- ~MDNode();
+ static MDNode *get(LLVMContext &Context, Value *const *Vals,
+ unsigned NumVals);
+ // getWhenValsUnresolved - Construct MDNode determining function-localness
+ // from isFunctionLocal argument, not by analyzing Vals.
+ static MDNode *getWhenValsUnresolved(LLVMContext &Context, Value *const *Vals,
+ unsigned NumVals, bool isFunctionLocal);
+
+ static MDNode *getIfExists(LLVMContext &Context, Value *const *Vals,
+ unsigned NumVals);
- /// getElement - Return specified element.
- Value *getElement(unsigned i) const {
- assert (getNumElements() > i && "Invalid element number!");
- return Node[i];
- }
-
- /// getNumElements - Return number of MDNode elements.
- unsigned getNumElements() const {
- return Node.size();
+ /// getOperand - Return specified operand.
+ Value *getOperand(unsigned i) const;
+
+ /// getNumOperands - Return number of MDNode operands.
+ unsigned getNumOperands() const { return NumOperands; }
+
+ /// isFunctionLocal - Return whether MDNode is local to a function.
+ /// Note: MDNodes are designated as function-local when created, and keep
+ /// that designation even if their operands are modified to no longer
+ /// refer to function-local IR.
+ bool isFunctionLocal() const {
+ return (getSubclassDataFromValue() & FunctionLocalBit) != 0;
}
+
+ // getFunction - If this metadata is function-local and recursively has a
+ // function-local operand, return the first such operand's parent function.
+ // Otherwise, return null. getFunction() should not be used for performance-
+ // critical code because it recursively visits all the MDNode's operands.
+ const Function *getFunction() const;
- // Element access
- typedef SmallVectorImpl<ElementVH>::const_iterator const_elem_iterator;
- typedef SmallVectorImpl<ElementVH>::iterator elem_iterator;
- /// elem_empty - Return true if MDNode is empty.
- bool elem_empty() const { return Node.empty(); }
- const_elem_iterator elem_begin() const { return Node.begin(); }
- const_elem_iterator elem_end() const { return Node.end(); }
- elem_iterator elem_begin() { return Node.begin(); }
- elem_iterator elem_end() { return Node.end(); }
-
- /// isNullValue - Return true if this is the value that would be returned by
- /// getNullValue. This always returns false because getNullValue will never
- /// produce metadata.
- virtual bool isNullValue() const {
- return false;
- }
+ // destroy - Delete this node. Only when there are no uses.
+ void destroy();
/// Profile - calculate a unique identifier for this MDNode to collapse
/// duplicates
void Profile(FoldingSetNodeID &ID) const;
- virtual void replaceUsesOfWithOnConstant(Value *From, Value *To, Use *U) {
- llvm_unreachable("This should never be called because MDNodes have no ops");
- }
-
/// Methods for support type inquiry through isa, cast, and dyn_cast:
static inline bool classof(const MDNode *) { return true; }
static bool classof(const Value *V) {
return V->getValueID() == MDNodeVal;
}
-};
-
-//===----------------------------------------------------------------------===//
-/// WeakMetadataVH - a weak value handle for metadata.
-class WeakMetadataVH : public WeakVH {
-public:
- WeakMetadataVH() : WeakVH() {}
- WeakMetadataVH(MetadataBase *M) : WeakVH(M) {}
- WeakMetadataVH(const WeakMetadataVH &RHS) : WeakVH(RHS) {}
-
- operator Value*() const {
- llvm_unreachable("WeakMetadataVH only handles Metadata");
+private:
+ bool isNotUniqued() const {
+ return (getSubclassDataFromValue() & NotUniquedBit) != 0;
}
-
- operator MetadataBase*() const {
- return dyn_cast_or_null<MetadataBase>(getValPtr());
+ void setIsNotUniqued();
+
+ // Shadow Value::setValueSubclassData with a private forwarding method so that
+ // any future subclasses cannot accidentally use it.
+ void setValueSubclassData(unsigned short D) {
+ Value::setValueSubclassData(D);
}
};
//===----------------------------------------------------------------------===//
-/// NamedMDNode - a tuple of other metadata.
-/// NamedMDNode is always named. All NamedMDNode element has a type of metadata.
-template<typename ValueSubClass, typename ItemParentClass>
- class SymbolTableListTraits;
-
-class NamedMDNode : public MetadataBase, public ilist_node<NamedMDNode> {
+/// NamedMDNode - a tuple of MDNodes.
+/// NamedMDNode is always named. All NamedMDNode operand has a type of metadata.
+class NamedMDNode : public Value, public ilist_node<NamedMDNode> {
friend class SymbolTableListTraits<NamedMDNode, Module>;
+ friend struct ilist_traits<NamedMDNode>;
friend class LLVMContextImpl;
-
NamedMDNode(const NamedMDNode &); // DO NOT IMPLEMENT
- void *operator new(size_t, unsigned); // DO NOT IMPLEMENT
- // getNumOperands - Make this only available for private uses.
- unsigned getNumOperands() { return User::getNumOperands(); }
+ std::string Name;
Module *Parent;
- SmallVector<WeakMetadataVH, 4> Node;
- typedef SmallVectorImpl<WeakMetadataVH>::iterator elem_iterator;
+ void *Operands; // SmallVector<WeakVH<MDNode>, 4>
+ void setParent(Module *M) { Parent = M; }
protected:
- explicit NamedMDNode(LLVMContext &C, const Twine &N, MetadataBase*const* Vals,
+ explicit NamedMDNode(LLVMContext &C, const Twine &N, MDNode*const *Vals,
unsigned NumVals, Module *M = 0);
public:
- // Do not allocate any space for operands.
- void *operator new(size_t s) {
- return User::operator new(s, 0);
- }
- static NamedMDNode *Create(LLVMContext &C, const Twine &N,
- MetadataBase*const*MDs,
+ static NamedMDNode *Create(LLVMContext &C, const Twine &N,
+ MDNode *const *MDs,
unsigned NumMDs, Module *M = 0) {
return new NamedMDNode(C, N, MDs, NumMDs, M);
}
/// getParent - Get the module that holds this named metadata collection.
inline Module *getParent() { return Parent; }
inline const Module *getParent() const { return Parent; }
- void setParent(Module *M) { Parent = M; }
-
- /// getElement - Return specified element.
- MetadataBase *getElement(unsigned i) const {
- assert (getNumElements() > i && "Invalid element number!");
- return Node[i];
- }
-
- /// getNumElements - Return number of NamedMDNode elements.
- unsigned getNumElements() const {
- return Node.size();
- }
- /// addElement - Add metadata element.
- void addElement(MetadataBase *M) {
- resizeOperands(0);
- OperandList[NumOperands++] = M;
- Node.push_back(WeakMetadataVH(M));
- }
+ /// getOperand - Return specified operand.
+ MDNode *getOperand(unsigned i) const;
+
+ /// getNumOperands - Return the number of NamedMDNode operands.
+ unsigned getNumOperands() const;
- typedef SmallVectorImpl<WeakMetadataVH>::const_iterator const_elem_iterator;
- bool elem_empty() const { return Node.empty(); }
- const_elem_iterator elem_begin() const { return Node.begin(); }
- const_elem_iterator elem_end() const { return Node.end(); }
- elem_iterator elem_begin() { return Node.begin(); }
- elem_iterator elem_end() { return Node.end(); }
+ /// addOperand - Add metadata operand.
+ void addOperand(MDNode *M);
- /// isNullValue - Return true if this is the value that would be returned by
- /// getNullValue. This always returns false because getNullValue will never
- /// produce metadata.
- virtual bool isNullValue() const {
- return false;
- }
+ /// setName - Set the name of this named metadata.
+ void setName(const Twine &NewName);
- virtual void replaceUsesOfWithOnConstant(Value *From, Value *To, Use *U) {
- llvm_unreachable(
- "This should never be called because NamedMDNodes have no ops");
- }
+ /// getName - Return a constant reference to this named metadata's name.
+ StringRef getName() const;
/// Methods for support type inquiry through isa, cast, and dyn_cast:
static inline bool classof(const NamedMDNode *) { return true; }
}
};
-//===----------------------------------------------------------------------===//
-/// Metadata -
-/// Metadata manages metadata used in a context.
-
-class Metadata {
-public:
- typedef std::pair<unsigned, WeakVH> MDPairTy;
- typedef SmallVector<MDPairTy, 2> MDMapTy;
- typedef DenseMap<const Instruction *, MDMapTy> MDStoreTy;
- friend class BitcodeReader;
-private:
-
- /// MetadataStore - Collection of metadata used in this context.
- MDStoreTy MetadataStore;
-
- /// MDHandlerNames - Map to hold metadata handler names.
- StringMap<unsigned> MDHandlerNames;
-
-public:
- /// RegisterMDKind - Register a new metadata kind and return its ID.
- /// A metadata kind can be registered only once.
- unsigned RegisterMDKind(const char *Name);
-
- /// getMDKind - Return metadata kind. If the requested metadata kind
- /// is not registered then return 0.
- unsigned getMDKind(const char *Name);
-
- /// getMD - Get the metadata of given kind attached with an Instruction.
- /// If the metadata is not found then return 0.
- MDNode *getMD(unsigned Kind, const Instruction *Inst);
-
- /// getMDs - Get the metadata attached with an Instruction.
- const MDMapTy *getMDs(const Instruction *Inst);
-
- /// setMD - Attach the metadata of given kind with an Instruction.
- void setMD(unsigned Kind, MDNode *Node, Instruction *Inst);
-
- /// getHandlerNames - Get handler names. This is used by bitcode
- /// writer.
- const StringMap<unsigned> *getHandlerNames();
-
- /// ValueIsDeleted - This handler is used to update metadata store
- /// when a value is deleted.
- void ValueIsDeleted(const Value *V) {}
- void ValueIsDeleted(const Instruction *Inst);
-
- /// ValueIsCloned - This handler is used to update metadata store
- /// when In1 is cloned to create In2.
- void ValueIsCloned(const Instruction *In1, Instruction *In2);
-};
-
} // end llvm namespace
#endif
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